18results about How to "Wide frequency range" patented technology

The present invention relates to the field of wireless communication technology, and proposes a communication circuit, method, device and system. The communication circuit includes a modulation element, an energy convergence network and a second resonant network. The modulation element disperses the energy of a first microwave signal of a first frequency at a first port and transmits it to the energy network from a second port. The energy convergence network converges the dispersed energy to obtain a second microwave signal. The second resonant network performs secondary frequency selection on the second microwave signal to generate an oscillation signal of a second resonant frequency. The oscillation signal is transmitted to the modulation element through a third port to mix with the first microwave signal to obtain a frequency-converted signal of a second frequency. The present invention sets up several signal transmission paths from the energy convergence network to the second resonant network without passing through the modulation element, which can reduce the loss of the second microwave signal, obtain a frequency-converted signal with increased power, and correspondingly reduce the transmission power requirement of the transceiver device and reduce the microwave driving power threshold of the communication circuit.

A full-range diaphragm with a three-fold loop and dual voice coils includes a diaphragm body and an inner voice coil, an outer voice coil, an inner support frame, and an outer support frame disposed on the inner side of the diaphragm body. The inner support frame, inner voice coil, outer voice coil, and outer support frame are arranged sequentially from the inside to the outside on the inner side of the diaphragm body. The diaphragm body includes an inner loop, a middle loop, and an outer loop arranged sequentially from the inside to the outside, with the cross-sectional dimensions of the inner loop, middle loop, and outer loop increasing sequentially. This invention, by setting a three-fold loop structure from the inside to the outside, and with the height of the three loops gradually increasing from the inside to the outside, combined with the support stiffness of the inner and outer sides of the diaphragm body, enables the three loops to not only achieve precise frequency band coverage when vibrating independently, but also to achieve full-range coordination during vibration. It has strong practicality and significant potential for widespread application.

The invention relates to a self-resetting two-way colloid damper and an assembling method thereof, and belongs to the technical field of vibration control, the self-resetting two-way colloid damper comprises a piston connecting rod, a guide cylinder, an upper pressing plate, a cylinder body, a piston rod, an upper piston, a lower piston, a lower pressing plate, a piston rod limiting nut, a tail cylinder, a compression spring and working liquid with a porous lyophobic matrix, and the cylinder body is filled with the working liquid. The guide cylinder and the tail cylinder are respectively arranged at two ends of the cylinder body to form a cylinder body of the damper; an upper pressing plate is arranged on the side, close to the guide cylinder, in the cylinder of the damper, and a lower pressing plate is arranged on the side, close to the tail cylinder, in the cylinder of the damper. An upper piston and a lower piston are oppositely arranged on the inner side of the upper pressing plate and the inner side of the lower pressing plate correspondingly. A working liquid with a porous lyophobic matrix is filled between the upper piston and the lower piston; and the compression spring is sleeved on the piston rod between the upper piston and the lower piston. According to the invention, the problem of vibration control under normal use of constructional engineering and other dynamic systems can be solved, and the design of constructional engineering based on functionality and safety is realized.

The invention relates to the technical field of communication, and provides an antenna. The antenna comprises a reflecting plate, a phase shifter, a combiner and a radiation unit, and the phase shifter is arranged below the reflecting plate and comprises a phase shifter cavity and a phase shifting circuit arranged in the phase shifter cavity; the combiner is arranged above the reflecting plate and comprises a combiner cavity and a combining circuit arranged in the combiner cavity; the radiating unit is arranged above the reflecting plate, the phase shift circuit is connected with the combining circuit, and the combining circuit is connected with the radiating unit. By means of the arrangement, the phase shifter and the combiner are arranged separately and located on the upper side and the lower side of the reflecting plate respectively, so that the combiner and the phase shifter can be debugged and installed independently, the phase debugging difficulty is effectively reduced, the width of the cavity of the phase shifter is not limited any more, and the frequency band range application range is wider; the combiner comprises a combiner cavity and a combining circuit arranged in the combiner cavity, so that the loss of the combiner is smaller; therefore, the loss is reduced while the phase is conveniently and independently debugged.

The embodiment of the invention discloses a direction finding antenna, and relates to the technical field of radio monitoring direction finding, a PCB dielectric substrate is adopted to carry antenna units, the antenna is combined in an upper and lower layered mode through a step-shaped structure of the antenna, the miniaturization design of the antenna is achieved, the first antenna unit and the second antenna unit which are arranged on the upper and lower layers respectively cover different frequency bands, and the antenna performance is improved. The antenna unit is arranged on the PCB dielectric substrate to ensure the expansion of the working coverage frequency band of the antenna, the dielectric substrates are arranged in a crossed manner, the stability of the dielectric substrates is realized on the premise of ensuring the relative position relation of the antenna and the feed transmission lines, and the feed transmission lines corresponding to the antenna units are arranged on the PCB dielectric substrate to ensure the stability of the relative position relation of the antenna and the feed transmission lines. The influence of the antenna itself and the feed transmission line on the performance of other antennas can be reduced, so that the stability of the antenna performance is ensured, and the miniaturization design and the antenna performance of the direction-finding antenna are both considered.

The application discloses a construction of a magneto-optical photonic crystal waveguide and a nontrivial one-way bulk state robust transmission method. The waveguide can excite a reverse-handed one-way boundary state and a one-way bulk state with reverse transmission simultaneously by parameter design of a square magneto-optical photonic crystal waveguide. The reverse-handed one-way boundary state is absorbed by upper and lower boundary conditions with scattering boundary conditions. Under the strong light transmission restriction of the square magneto-optical photonic crystal, the one-way bulk state is limited in the strip to transmit in one direction, thereby avoiding being absorbed, so that the waveguide forms a nontrivial one-way bulk state. The structure is topologically protected, and the nontrivial one-way bulk state robust transmission with complete one-way conductivity of the waveguide channel is realized. Further, the controllability of the nontrivial one-way bulk state transmission frequency can be realized by adjusting the magnetic field strength. The application has wide application prospects in the fields of robust energy transmission, optical communication technology and integrated photonic circuit.

The present invention proposes a high-performance phase-locked digital frequency synthesis device, comprising: the output end of a crystal oscillator circuit is connected to the input end of a DDS device, the output end of a DSP device is connected to the input end of the DDS device, the output end of the crystal oscillator circuit is connected to the input end of a mixer, the output end of the mixer is connected to the input end of a bandpass filter, the output end of the bandpass filter is connected to the input end of a phase detector, the output end of the phase detector is connected to the input end of a low-pass filter device, the output end of the low-pass filter device is connected to the input end of an amplifier, the output end of the amplifier is connected to the input end of a voltage-controlled oscillator, the output end of the voltage-controlled oscillator is connected to the input end of a dual-mode pre-frequency divider, the output end of the dual-mode pre-frequency divider is connected to the input end of an N-frequency divider, and the output end of the N-frequency divider is connected to the input end of the phase detector.

The utility model belongs to electroacoustic transducer technical field discloses a moving coil type sound head and microphone. The moving coil type sound head includes shell, first sound pickup subassembly and second sound pickup subassembly, the inside of shell has acoustic cavity, shell has the sound inlet, acoustic cavity is connected with outside through sound inlet, first sound pickup subassembly includes first magnet and first sound film, is provided with first coil on first sound film, first sound film is opposite sound inlet and is arranged in acoustic cavity, first magnet is arranged in acoustic cavity, first sound film vibration drives first coil to move relatively first magnet and produces electric current, second sound pickup subassembly includes second magnet and second sound film, second magnet is arranged in acoustic cavity, second sound film and first sound film are along the propagation direction of sound wave in acoustic cavity and are spaced, are provided with second coil on second sound film, second sound film vibration drives second coil to move relatively first magnet and produces electric current. The moving coil type sound head improves the sensitivity of sound signal acquisition, can better capture and restore sound signal.

This utility model belongs to the field of smart ring technology, and relates to a small-sized haptic feedback device for rings. It includes a touch module, which is bonded to an FPC board inside the ring and fixed by a transparent encapsulant. The touch module includes a housing and a vibration component disposed within the housing. The vibration component includes piezoelectric ceramic and a protrusion. One end of the protrusion is bonded to an upper metal sheet on the piezoelectric ceramic, and the other end extends to the outside of the housing. The protrusion can move up and down under the action of the piezoelectric ceramic, transmitting the vibration of the vibration component to the skin of the finger. This utility model proposes a small-sized, low-power, high-precision haptic feedback solution suitable for smart rings, achieving efficient haptic feedback within a limited space while also considering wearing comfort and battery life.

The utility model discloses a radio frequency self -checking device for FDD microwave communication system, including coupling circuit, frequency conversion circuit, frequency source circuit and controller, the coupling circuit is equipped with a two -way radio frequency port for with the two -way connection of external duplexer's tuning terminal, the through output port of coupling circuit is connected with the radio frequency input port of frequency conversion circuit, the intermediate frequency output port of frequency conversion circuit is connected with the coupling input port of coupling circuit, the local oscillator port of frequency conversion circuit is connected with the output port of frequency source circuit, it belongs to communication field, through this self -checking device, the signal of transmitting channel in system is frequency conversion to the signal of receiving channel, and sends back receiving channel and carries out the signal processing effect.

The application provides an IGBT module electrical parameter on-line measuring device and method, the device comprises an interrupt control unit, a micro control unit and an analog-digital conversion unit, the micro control unit comprises a micro processing unit and a first timing unit, the application does not use FPGA, greatly reduces the hardware cost, reduces the power consumption and the circuit board area of on-line measuring device, and is convenient for integration.The application realizes the high-speed sampling of electrical parameters in the transient process of IGBT module turn-on or turn-off based on a first interrupt signal, realizes the low-speed sampling of electrical parameters in the steady state process of IGBT module turn-on or turn-off through a second interrupt signal, simultaneously realizes the high-speed and low-speed sampling of IGBT module turn-on or turn-off, the frequency range of sampling pulse is wide, and the data amount of electrical parameter sampling is greatly reduced, which provides a data basis for the fault diagnosis of power electronic equipment device level, on-line estimation of junction temperature and aging health index monitoring.

This invention discloses a method, apparatus, storage medium, and electronic device for improving the source bandwidth, comprising: acquiring seismic data from different energy levels using different source excitation methods; performing frequency analysis on the seismic data, statistically analyzing the energy distribution of each frequency component, and plotting spectral curves; normalizing the spectral curves to generate normalized amplitude spectra; determining the intersection point of the spectra of the two energy levels in the normalized amplitude spectrum, and using this intersection point as a boundary to extract the low-frequency region of the high-energy-level data and the high-frequency region of the low-energy-level data; assigning maximum amplitude values ​​to the frequency components of the extracted high-frequency and low-frequency regions respectively, and then superimposing them to generate broadband seismic data; and designing the source excitation ratio based on the generated data results. According to the method, apparatus, storage medium, and electronic device of this invention, seismic data can be superimposed to obtain seismic data that more closely approximates reality, and the excitation ratio can be precisely designed based on the seismic data.

The application discloses a same-frequency control strategy based on an H-MMC motor driving system; the motor driving system comprises a permanent magnet synchronous motor, an H-MMC and an alternating current power grid; firstly, a double-loop control is adopted to obtain motor-side d-axis and q-axis voltage reference values, a phase angle superposition amount is calculated in real time, and the motor-side d-axis and q-axis voltage reference values are added to a motor terminal voltage phase angle obtained by a phase-locked loop to obtain a final motor phase angle so as to adjust the motor-side three-phase voltage reference values in real time; a double-loop control is adopted to obtain a grid-side three-phase voltage reference value; hierarchical capacitor voltage balance control and circulating current control are adopted to obtain a neutral point voltage reference value and a bridge arm voltage reference value superposition amount; voltage modulation wave superposition amount of a sub-module voltage is obtained through voltage balance control; finally, driving signals of each sub-module are generated through CPS-PWM after the modulation wave of each sub-module voltage is calculated according to the above control; through real-time adjustment of the phase angle of the motor-side three-phase voltage reference values, the application can realize that the bridge arm differential frequency power approaches to 0, and can effectively suppress the capacitor voltage fluctuation of the sub-module without increasing circulating current or injecting reactive power, so that the stable operation of the system under the same frequency condition is realized; and the application has the advantages of simple control and small loss.

The invention relates to the technical field of antennas, in particular to a liquid crystal material-based variable double-ring multi-bit coding RCS (radar cross section) reduction metasurface, which consists of five layers of structures, namely an upper dielectric substrate, a tuning metal patch, a liquid crystal material, a lower dielectric substrate and a metal floor from top to bottom. The array is composed of N * N units, the metal patch layer is subjected to a plurality of slotting treatments based on a traditional double-ring shape, and a plurality of communication branch treatments are added to the metal patch layer, so that the surface current and electric field distribution of the metal patch layer is changed, more resonance modes are introduced, and the metasurface unit can respond to a wider frequency range. In order to solve the problems that a traditional RCS reduction metasurface is single in performance and poor in environment adaptability, the metasurface unit reflection phase is regulated and controlled in a target frequency band by loading a liquid crystal material, and multi-bit coding is achieved by changing the liquid crystal dielectric constant, so that the scattering characteristic of an array plane can be reconstructed, and the RCS is reduced by more than 10 dB.

The invention discloses a DLL circuit, a control method and electronic equipment, and belongs to the technical field of electronic equipment. The DLL circuit includes a phase discriminator, a charge pump, a voltage-controlled delay line, and a processing unit. An annular oscillator in the voltage-controlled delay line carries out oscillation processing on an input clock signal and outputs an oscillation signal. Under the condition that the frequency of the oscillation signal does not meet the target frequency, the processing unit adjusts the load capacitance of the second delay unit of the ring oscillator until the target frequency is met, the ring oscillator is controlled to stop working, and the load capacitance of the first delay unit and the load capacitance of the second delay unit are equal to the load capacitance of the first delay unit in the voltage-controlled delay line. The voltage-controlled delay line delays an input clock signal and outputs a target clock signal. The phase discriminator outputs a phase difference signal according to the phases of the target clock signal and the input clock signal. The charge pump outputs a control voltage signal according to the phase difference signal. According to the invention, the adjustment range of the delay duration of the first delay unit is improved.

The invention discloses a high-dynamic deformation monitoring data processing method combining MEMS (Micro Electro Mechanical System) and GNSS (Global Navigation Satellite System) observation data, and particularly relates to the technical field of high-dynamic deformation monitoring data processing, which specifically comprises the following steps of: 1, acquiring MEMS observation data and GNSS observation data of an observation target; basic data about an observation target is determined, and related data processing is carried out; 2, judging the deformation frequency of the observation target through an MEMS accelerometer; judging the deformation frequency of the observation target through the related deformation basic data of the observation target; 3, performing quality control on the GNSS high-dynamic deformation monitoring data; 4, determining the deformation amplitude of the observation target through the GNSS data; judging the deformation amplitude of the observation target through the related deformation basic data of the observation target; and 5, carrying out data fusion processing on the MEMS observation data and the GNSS observation data.

The invention relates to an audio enhancement method and device and an earphone. The audio enhancement method comprises the following steps: acquiring an air conduction audio signal and a bone conduction audio signal; acquiring a first audio feature of the air conduction audio signal and a second audio feature of the bone conduction audio signal; performing feature extraction on the bone conduction audio signal through a trained feature extraction model to obtain a voiceprint feature of the bone conduction audio signal; inputting the voiceprint feature of the bone conduction audio signal, the first audio feature and the second audio feature into a trained amplitude prediction model to obtain a predicted amplitude; and enhancing the audio based on the predicted amplitude to obtain a target audio signal. According to the invention, the dual model mechanism fuses the advantages of bone conduction and air conduction, so that the obtained target audio signal does not lose the frequency band, the noise reduction is realized, and the audio quality is improved.

The invention provides a modified P (VDF-TrFE) sensor and a preparation method thereof, a flexible piezoelectric diaphragm is made of a vinylidene fluoride-trifluoroethylene polymer P (VDF-TrFE) film piezoelectric material, has the characteristics of wide frequency band, good biocompatibility, softness and the like, can stably pick up a vibration acoustic signal by being coupled to a hammer bone neck of a human ossicular chain, and has the advantages of high sensitivity, high sensitivity and the like. Meanwhile, noise in the body can be avoided or weakened, electric hearing can be better achieved, meanwhile, better biocompatibility and durability are achieved, and the innovative cuboid laminated piezoelectric film-cantilever beam composite structure is beneficial to improving the conversion efficiency of vibration-voltage signals. The design of a redundant circuit is reduced, the signal-to-noise ratio is improved, and the speech perception ability of a user can be improved through a wider frequency spectrum and a better frequency response curve.